Abstract
In this paper, we propose a joint feedforward equalizer (FFE) and an error-based feedforward equalizer (Err-FFE) to eliminate the serious inter-symbol interference and high-frequency colored noise for 100 Gb/s 4-level pulse-amplitude modulation (PAM4) optical systems. The proposed Err-FFE is first designed to replace the joint post-filter (PF) and maximum likelihood sequence estimation (MLSE). The Err-FFE algorithm has only 15% computational complexity compared to the joint PF and MLSE. Moreover, experimental results show that the performance of joint FFE and Err-FFE algorithm is much better than that conventional FFE, and is comparable with that of FFE joint with PF and MLSE. In conclusion, the proposed Err-FFE has both low computational complexity and excellent performance for PAM4-based optical systems, which indicates its potential for applications in low-cost and low-power short-reach optical interconnects.
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